lim(x->0) [e^x - √(1+2x)]/(1-cosx) (0/0)
=lim(x->0) [e^x - 1/√(1+2x) ]/sinx (0/0)
=lim(x->0) [e^x + 1/(1+2x)^(3/2) ]/cosx
= 2
lim(x->0) [e^x - √(1+2x)]/(1-cosx) (0/0)
=lim(x->0) [e^x - 1/√(1+2x) ]/sinx (0/0)
=lim(x->0) [e^x + 1/(1+2x)^(3/2) ]/cosx
= 2